If your transducer is not hooked up, or if you have your sonar
set to 'Off', then you won't see any images on the 2d, SI, or DI views.
I'm not sure if the views will even display.
If the transducer is hooked up and set to 'On', while out of the water, you won't see much,
but the views will be working. You should see water temperature, but in this
case, it will be the air temperature around the transducer.
For the sonar to function properly, and to be able to see something, you will have to be on the water.